I recall a month ago when it was not fking cold as hell outside my car did not sound like a charger/mustang was bit tamed and did not have that rumble in it. Now when its constant cold outside even at idle it sounds bit louder.. is that normal characteristic of a v6? Or i need to get the engine looked at ? Maybe its cause of missing bumper i hear it bit more but even the muffler sounds bit louder as if it was a muscle car which it clearly is not .. right ? it's a 07 LS.